fix Chili.Object.AddChild

[XNTEABDSC]

When use index, AddChild forgot to

children[hobj] = index
children[objDirect] = index

[GoogleFrog]

Does anything use index currently?

[XNTEABDSC]

layoutpanel use index to sort controls.
RemoveChild do nothing if not self.children[childDirect]. then add it again will cause "There is already a control with the name"

[GoogleFrog]

Sorry, I mean does anything use the index parameter in AddChild(obj, dontUpdate, index)?

[XNTEABDSC]

In zk, none.

But people may use it.